public bool NextFunction(Executer exec, out Function func)
{
func = null;
if (EndOfStream)
{
return(false);
}
int originalPos = position;
if (char.IsLetter(_buffer[position]) || _buffer[position] == '_')
{
position = FindAcceptableFuncChars(_buffer, ++position);
if (position < _buffer.Length)
{
StringSegment name = _buffer.Subsegment(originalPos, position - originalPos);
SkipWhiteSpace();
if (Next("("))
{
IList <object> args;
position = GroupParser.ReadGroup(_buffer, position - 1, exec, out args) + 1;
func = new Function(exec);
func.Parse(_buffer.Subsegment(originalPos, position - originalPos), name, args);
return(true);
}
}
}
position = originalPos;
return(false);
}
public bool NextIndices(Executer exec, out int[] indices)
{
indices = null;
int originalPos = position;
if (!EndOfStream && _buffer[position] == '[')
{
IList <object> args;
position = GroupParser.ReadGroup(_buffer, position, exec, out args) + 1;
indices = new int[args.Count];
for (int i = 0; i < args.Count; ++i)
{
int?index = args[i] as int?;
if (index == null)
{
throw ThrowHelper.InvalidTypeInExpression(args[i].GetType().Name, typeof(int).Name);
}
else
{
indices[i] = index.Value;
}
}
return(true);
}
position = originalPos;
return(false);
}
public bool NextString(out string parsed)
{
if (EndOfStream || (_buffer[position] != '\"' && _buffer[position] != '\''))
{
parsed = null;
return(false);
}
int endPos = GroupParser.ReadString(_buffer, position, out parsed) + 1;
position = endPos;
return(true);
}